Aliphatic Hydrocarbons

The compounds which contain hydrogen and carbon only are called hydrocarbon.

e.g mathane,ethane etc

there are two classes of hydrocarbons.

1. open chain hydrocarbons
2. closed chain hydrocarbon

1. open chain hydrocarbons

   hydrocarbons which contains open chain of  carbon atoms are called open chain hydrocarbons or aliphatic hydrocarbons.the open chain hydrocarbons have also two types.

1. saturated hydrocarbons (alkanes)
2. unsaturated hydrocarbons (akens and alkynes)

1. saturated hydrocarbons.

    the hydrocarbons in which all carbon atoms are bonded by a single bonds are called saturated hydrocarbons or alkanes or parafins e.g mathan,ethane propane etc.

in sturated hydrocarbons all four valencies of carbon are fully satisfied.hence it can not take up any more hydrogen.
2. unsturated hydrocarbons.

  

the hyrocarbons which contain either a double bond and a triple bond are called unsaturated hydrocarbons   

      e.g ethene,propene.